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Definitive XML Schema by Priscilla Walmsley

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Chapter 18 Redefining schema components

Redefinition is a way to extend and modify schemas over time, while still reusing the original definitions. It involves defining a new version of a schema component, with the same name, that replaces the original definition throughout the schema. This is very useful for extending and creating a subset of an existing schema. It is also useful for performing minor modifications over time. This chapter explains redefinition in detail.

18.1 Redefinition basics

Only certain types of schema components can be redefined, namely complex types, simple types, named model groups, and attribute groups. The new definitions must be based on the original definitions. For types, this means ...

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